Automatic window lock



E. 'r. GOlODRICH AUTOMATIC WINDOW LOCK Original Filed Feb. 11, 1933INVENTOR.

I 50/704 0 T Gooawcw 6%, M T f ATTORNEYS ilk Reissued Dec. 25, 1934UNI-TED STATES AUTOMATIC WINDOW LOCK Edmond T. Goodrich, Detroit, Mich.

Original No. 1,925,244, dated September 5, 1933,

Serial No. 656,216, February 11, 1933.

Application for reissue April 27, 1934, Serial No.

4 Claims.

This invention relates to an automatic window lock and has todoparticularly with that type of lock for normally limiting the movementof a. window sash. I

Heretofore various types of locks have been used, which, when actuatedor manually positioned, limit the movement of a window. In most of theseprior art devices it is usually necessary to cutaway or otherwisefabricate either a part of the window sash-or a part of the frame.

It is the object of the present invention to provide an extremely simpleand efiicacious unit which may be readily attached to a part of thewindow frame, preferably the inside stop, and which will automatically,by its own inherent construction, move into locking position to permitonly a predetermined movement of the window sash. More specifically, thepresent invention embodies a lock or stop unit adapted to be pivotallyconnected to the inside stop of the window frame and out of the verticalplane of movement of the window sash, but a portion of which because ofcertain counterweighting construction will be normally projected intothe plane of the window sash.

Other features embody details of construction as will be more clearlyset forth in the claims.

In the drawing:

Fig. 1 is a vertical sectional view of a standard window frame andwindow sash unit and illustrating the preferred manner of positioning mynovel stop or lock unit relative to the lower window sash.

Fig. 2 is a fragmentary elevation showing the preferred manner ofmounting the lock or stop to the inside stop of the frame.

Fig. 3 is a perspective view of a slightly modified form of my novellock unit, which may be used in connection with either window sash.

Fig. 4 is a fragmentary view illustrating a slightly modified form ofthe lock unit, where an additional means is provided for maintaining thelock unit in fixed position, and illustrating the preferred embodiment.I

In illustrating my invention I have shown same as being used inconnection with a standard window frame of the double hung type, whereinthe upper window sash 2 and the lower window sash 3 are guided in theirupward and downward movement by three members, namely, a blind stop orreveal 4, a parting stop 5, and an inside stop or garnish molding 6.

My window lock or stop unit is best illustrated in Fig. 3 and may begenerallydesignated 7. This unit '7 is preferably provided with anaperture 8 through which the unit is pivotally mounted by means of ascrew 9 to the inside stop, as best shown in Figs. 1 and 2. This lockmember 7 preferably consists of an arm portion 10, a. contactofclockwise.

ing or stop surface 11, and a counterweight 12 having a curved portion13. i

This lock member 7 may consist of a simple, relatively thin stamping,and because of the counterweighted portion 12 the arm 10 will normallybe positioned at an angle when the arm is freely hung by the pivot 9, asshown in Fig. 1. The mass of the counterweight will obviously determinethe normal angle with which the arm 10 hangs with respect to thevertical.

When the lower sash 3 is in its normal, closed and lowermost position,the lock member '7 will hang in the position shown in solid lines inFig. 1. When the window sash 3 is raised, either from the inside or fromthe outside, the upper member of the sash 3 will contact with the fiatsurface '11 of the lock members, which contact will limit the upwardmovement of the window sash 3. With the window in the position shown inFig. 1, the outwardly-inclined and curved surfaces 13 will effectivelyprevent movement of the stop 7 by the insertion of wire or any othermeans through the bottom of the window sash in an attempt to dislocatethe lock member. In other words, the effect of contact of any implementwith the surface 13 will tend to swing the stop 7 counterclockwise, asviewed in Fig. 1, instead To raise the window higher from the inside, itis only necessary to grasp the counterweighted portion 12 and swing themember 7 inwardly.

In its preferred use, the member 7 is adapted to be automaticallypositioned relative to the lower window sash 3 and to only normallylimit the upward movement thereof. It will be obvious that my stop withthe counterweighted principle can also be utilized to limit the loweringof the upper window sash. To accomplish this the member 7 willpreferably have an extension 14 which may be normally positioned tocontact with the lower surface of the upper member of the window sash 2.

In the modification shown in Fig. 4, the aperture of the lock 7 is shownprovided with a keyway 1.5 and the fastening means 16 is preferablyprovided with a small key projection, whereby when the lock member 7 iscontacted from the bottom by the window sash 3, the key will fit withinthe keyway to prevent lateral or oscillating movement of the lockmember.

What I claim is:

1. A one piece lock member for limiting the opening movement of a windowsash, comprising an arm pivotally mounted to a stop guide for the windowsash, said pivotal mounting being outside the normal plane of movementof the window sash, and a counterweight adjacent one end of said arm fornormally projecting a portion of said arm within the plane of movementof said window sash, said portion of the arm being shaped and normallypositioned to contact directly with said window sash to prevent anyfurther opening of the window and to rigidly hold the lock in positionif pressure is. applied to force the window to a wider open position.

2. A lock member for limiting the movement of a window sash, comprisingan arm pivotally mounted to a stop guide for the window sash, saidpivotal mounting being outside the normal plane of movement of thewindow sash, and a counterweight adjacent one end of said arm fornormally projecting a portion of said arm within the plane of movementof said window sash, said arm being normally positioned at an angle tothe vertical by said counterweight, said portionof the arm projectingwithin the plane of movement of the sash having a substantiallyhorizontal surface adapted to contact and limit the movement of thewindow sash, the combination of such substantially horizontal surface,angular arm, and pivotal mounting serving to more rigidly hold the lockin position if pressure is applied to force the Window to a wider openposition.

3. A lock member for limiting the movement of a window sash, comprisingan arm pivotally mounted to a stop guide for the window sash, saidpivotal mounting being outside the normal plane of movement of thewindow sash, and a counterweight adjacent one end of said am fornormally projecting a portion of said arm within the plane of movementof said window sash, said arm being normally positioned at an angle tothe vertical by said counterweight, said portion of the arm projectingwithin the plane of movement of the sash having a substantiallyhorizontal surface adapted to contact and limit the movement of thewindow sash, the combination of said substantially horizontal surface,angular arm and pivotal mounting serving to more rigidly hold the arm inposition if pressure is applied to force the window to a wider openposition, the greater portion ofsaid counterweighted portion being tothe rear of the window sash when in looking position and having a'lowersurface projecting inwardly and upwardly from the sash.

4. A one piece lock member for limiting the opening of a window sash,comprising an arm pivotally mounted to a stop guide forthe window sash,said pivotal mounting being outside the normal plane of movement of thewindow sash, said arm including a substantially flat locking surfacemovable about said pivot, and a counterweight extending at an angle tosaid arm to normally position said substantially fiat locking surface ina path to contact with the window, said locking surface being normallypositioned to contact directly with said window sash to prevent anyfurther opening of the window and serving to more rigidly hold the lockmember in position if pressure is applied to force the window to a wideropen position, said member being so pivotally mounted that it may beswung out of locking position by movement of said arm away-from the pathof movement of the window and beneath said pivot whereby said arm ismoved to a position substantially parallel with the window sash to allowthe window to be raised.

EDMOND T. GOODRICH.

